# Solana

### How to generate the proof with Solana?

<pre class="language-javascript"><code class="lang-javascript">const generate = async (schemaId: string, appid: string) => {
    try {
      //check if you install the Phatom wallet
      if (!("phantom" in window)) {
        return alert("Please install Phantom wallet")
      }
      
      const provider = window.phantom?.solana
      const <a data-footnote-ref href="#user-content-fn-1">resp</a> = await provider?.connect() //connect wallet
      const account = resp.publicKey.toString()

      //The appid of the project created in dev center     
      const appid = "39a00e9e-7e6d-461e-9b9d-d520b355d1c0"
      //The schemaId of the project
      const schemaId = "c7eab8b7d7e44b05b41b613fe548edf5"
            
      const connector = new TransgateConnect(appid)
      
      const isAvailable = await connector.isTransgateAvailable()
      if (!isAvailable) {
        return alert("Please install zkPass TransGate")
      }
      
      const res = (await connector.launchWithSolana(schemaId, account)) as Result

    } catch (err) {
      alert(JSON.stringify(err))
      console.log("error", err)
    }
  }
</code></pre>

{% hint style="info" %}
The result includes two signatures: the allocator signature and the validator signature. Developers should verify both signatures based on the other returned fields.&#x20;
{% endhint %}

### Verify Allocator Signature

#### Encode the allocator message struct

```javascript

import { Buffer } from "buffer"
import secp256k1 from "secp256k1"
import * as borsh from "borsh"
import sha3 from 'js-sha3'

//Attest struct for Solana
const SolanaTask = {
  struct: {
    task: 'string',
    schema: 'string',
    notary: 'string',
  },
}

const { taskId, allocatorSignature, validatorAddress } = res //return by Transgate

const sig_bytes = hexToBytes(allocatorSignature.slice(2));

const signatureBytes = sig_bytes.slice(0, 64);
const recoverId = Array.from(sig_bytes.slice(64))[0];

const plaintext = borsh.serialize(SolanaTask, {
    task: taskId,
    schema: schema,
    notary: validatorAddress,
 });

const plaintextHash = Buffer.from(sha3.keccak_256.digest(Buffer.from(plaintext)));

```

#### Recover the allocator address

```javascript
const signedAllocatorAddress = secp256k1.ecdsaRecover(signatureBytes, recoverId, plaintextHash, false);
```

#### Check if the signed allocator address is registered. The current  allocator address is fixed.

```javascript
return signedAllocatorAddress === "69e7d686e612ab57e3619f4a19a567b3b212a5b35ba0e3b600fbed5c2ee9083d"
```

### Verify Validator Signature

#### Generate the validator message

```javascript
import { Buffer } from "buffer"
import secp256k1 from "secp256k1"
import * as borsh from "borsh"
import sha3 from "js-sha3"

//Attest struct for Solana
const Attest = {
  struct: {
    task: "string",
    schema: "string",
    nullifier: "string",
    recipient: "string",
    publicFieldsHash: "string",
  },
}

const { taskId, uHash, validatorAddress, schema, validatorSignature, recipient, publicFieldsHash } = res //return by Transgate
const sig_bytes = hexToBytes(validatorSignature.slice(2)) //skip the 0x

const signatureBytes = sig_bytes.slice(0, 64)
const recoverId = Array.from(sig_bytes.slice(64))[0]

const plaintext = borsh.serialize(Attest, {
  task: taskId,
  nullifier: uHash,
  schema,
  recipient,
  publicFieldsHash,
})

const plaintextHash = Buffer.from(sha3.keccak_256.digest(Buffer.from(plaintext)))
```

#### Recover the validator address

```javascript
 const signedValidatorAddress = secp256k1.ecdsaRecover(signatureBytes, recoverId, plaintextHash, false);
```

#### Verify if the signed validator address matches the address assigned by the allocator

```javascript
return signedValidatorAddress === validatorAddress
```

{% hint style="info" %}
Here, we've only given the reference code for js verification. However, the result can also be verified on Solana.
{% endhint %}

[^1]:


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.zkpass.org/developer-guides/js-sdk/generate-proof-and-verify-the-result/solana.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.